Measurement Computing PCI-DAS6023 - Manual (Page 37)

PCI-DAS6023 and PCI-DAS6025 User's Guide Specifications
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Counters
Table 18. Counter specifications
User counter type 82C54
Number of channels 2
Resolution 16-bits
Compatibility 5 V/TTL
CTRn base clock source (software selectable) Internal 10 MHz, Internal 100 KHz or external connector (CTRn CLK)
Internal 10 MHz clock source stability
50 ppm
Counter n gate Available at connector (CTRn GATE).
Counter n output Available at connector (CTRn OUT).
Clock input frequency 10 MHz max
High pulse width (clock input) 15 ns min
Low pulse width (clock input) 25 ns min
Gate width high 25 ns min
Gate width low 25 ns min
Input low voltage 0.8 V max
Input high voltage 2.0 V min
Output low voltage 0.4 V max
Output high voltage 3.0 V min